William scott



(No Model.)

W. SCOTT.

GATE VALVE.

PatentedApr. 20, 1886.

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N. PETERSY PhelD-Llhugmplwr. WnsIlngXun. DA C.

Ilrrn SrArns I WILLIAM SCOTT, OF DETROIT, MICHIGAN, ASSIGNOR TO ROE STEPHENS, OF SAME PLACE.

GATE-VALVE.

SPEGIFICATEON forming part of Letters-Patent No. 340,371l dated April 20, 1886.

Application filed August 131 1885. Serial No. 174,334. (No model.)

fo all whom, z't may concern: upper ends of each of the disks a loop, K, Be it known that l, WILLInw SCOTT, of the interior dimensions of such loops being Detroit, in the county of Wayne and State ofv larger than the lugs J, so that when the disks Michigan, have invented new and useful Imare hung by means of such loops upon the provenients in Gate-Valves; and I do hereby lugs J they will have a little vertical play, 55

declare that the following is a full, clear, and and so that they will always, by their own exact description thereof', reference being had gravity, hang a little lower than' the wedge to the accompanying drawings, which form a and seat themselves when in operation, after part of this specification. which such freedom of motion on the lug al- This invention relates to certain new and lows the wedge to be forced down a little far- 6o useful improvements in gate or straightway ther, thereby holding the disks firmly against valves, and is especially designed as an iintheir seats. The wedge being cast in-brass, provement upon the structure of such valves the lugs cast thereon are malleable, thereby as shown and described in Letters Patent No. giving me an opportunity to slightly rivet r 5 302,434, issued to me, and dated July 22, 1884. upon their two side edges each of the lugs as 65 The invention consists in the peculiar conthey project through the loops of the disk, struction of the various parts and their cotnthereby rendering it impossible for the latter. bination, as more fully hereinafter described. to be accidentally displaced.

Figure lis a longitudinal vertical section In practice, the shell being in place and 2O of my improved valve. Fig. 2isaplan of the the operative parts in place in the shell with 7o wedge, one of the gates or disks, and a porthe valve open, and it is desired to close the tion ofthe screw. Fig. 3 is a perspective desaine, the wedge is run down by means of the tail showing the method of securing the gates screw-stem, carrying with it the disks hanging or disks to the central wedge. on either side thereof, until the disks are In the accompanying drawings, A reprebrought opposite their seats. Now, continu- 75 sents a shell of the usual form, having a reing slightly the motion of the screw forces movable cap, B, and screw-stem C, for raisthe wedge to drive outward the disks firmly ing or lowering the gates, and the packing against their seats. Studs L are formed ou gland D, applied to the cap B, and encircling the inner face of the disks, which engage with 3o the screw-stern to prevent leakage, these parts ledges M, formed on the inner face ofthe two 8o being common to all valves of this class. legs of the wedge, Vand thisengagement is for E represents the wedge, which is bifurcated, the purpose of preventing the disks from dropand consists of a stem, F, internally threaded ping too much in advance of the wedge, and to engage with the screw-stern C, and the two these parts are so arranged as not to interfere 'i 5 wedge-shaped wings G, secured to or integral with the vertical play ofthe disks upon the lugs 85 with the lower end of the same. The faces of J, whiletheledges M, by their engagement with the wings, instead of being parallel with one the studs L, form means for lifting the disks another, form converging angles, such wings H without allowing the weight to be thrownl being curved to conform to the shape of the upon the lugs J.

4o valve or the bearings upon the rear sides of That I claim as my invention is-' 90 the inner faces of the disks H, which have l. In a gate-valve, as described, the combiupon their inner faces and cast integral therenation, with the bifurcated wedge having with wedge-pieces I, orinclined planes formed .ledges M upon the inner surface, of the disks to correspond with the angles of the wedge II, loosely hung upon the said wedge and hav- E, so that when the latter is forced between ing studs L, arranged to engage said ledges, 95 such disks it drives them apart and holds them and the whole yarranged to serve with a stem firmly against their seats in the shell. and case, as set forth. y

Projecting from either side of the stem F, 2. In agate-valve operated by a screwstem,

A and opposite each other, there are formed the combination of a shell with two disks havlugs J, and there are formed or cast upon the ing loops K and studs L, and abifurcated rco wedge, E, having lugs J and ledges M, suh- Constructed and operating snbstautfiallyasand stantially as and for` the purposedeseribed. for the purpose specified.

3. In a, gate-valve, the combination of :t shell Y, with disks having loops and studs and rear TILLIM SCOT'I 5 inclined projections, and a bifureated Wedge Witnesses:

having ledges, as M, and having a hub which H. S. SPRAGUE, has lugs projecting therefrom, the parts being CHARLES J. HUNT. 

